Abstract
An insulinoma is an endocrine tumor of the pancreas derived fro m the beta cells with abnormal insulin secretion. An insulinoma is rare, the incidence being estimated at only four per one million person-years. The association of diabetes mellitus and insulinoma is extraordinarily rare, but we should not overlook an insulinoma as a possible cause of hypoglycemia in patients with diabetes mellitus. A 70-year-old diabetic man who had been treated with oral hypoglycemic agents for type 2 diabetes suffered from night sweating for 10 days. Even after he stopped taking h is oral hypoglycemic agents, the night sweating continued. The patient was admitted to evaluate the cause of the recurrent hypoglycemic events. After a 72-hour fasting test and selective arterial calcium stimulation test with venous sampling, he was diagnosed with insulinoma accompanied by type 2 diabetes mellitus. In the course of the study, the patient was also incidentally diagnosed with lung cancer. (J Kor Diabetes Assoc 31:517~519, 2007)
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